Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b623d7ca880ee829258d30be6c7b6f9a860a9ddaaf2f2a020ee1fb92cc539772:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^